If you use a private npm registry, you know the pain of switching between a
bunch of different .npmrc files and manually managing symlinks. Let that be a
problem no more! npmrc is here to save the day, by making it dead simple to
switch out your .npmrc with a specific named version. It also tries to protect
you from your own stupid self by making sure you don't accidentally overwrite an
.npmrc that you actually want to keep.